President Obama traveled to Pennsylvania on Friday to make the case for his "fiscal cliff" plan. But he didn't leave without mentioning the other story everyone in Washington is talking about: Joe Biden's trip to Costco on Thursday.

Obama, speaking at K'Nex toy factory, said: "Joe Biden was at Costco. He wanted to buy some of this stuff, but I told him he had too much work to do. I wasn't going to have him building roller coasters all day long." 

Obama then went into full Santa/dad mode. 

"I've been keeping my own naughty and nice list for Washington, so you should keep your eye on who gets some K'Nex this year," Obama said. "There are going to be some members of Congress who get 'em, and some who don't."